Issues:
Sections:
Issue 93
GENERAL BIOLOGY
UDK: 574.586
SEASONAL DYNAMICS OF THE SPECIES STRUCTURE OF PHYTOPERIPHYTON COMMUNITIES IN THE COASTAL WATERS OF THE DAGHESTAN ZONE OF THE CASPIAN SEA
AMAEVA Frangiz Shamilievna,
ABDURAKHMANOVA Ayshat Abdulmajidovna
Studied has been the phytoperiphyton species structure in seasonal dynamics in the Daghestan coastal waters of the Caspian Sea. It is the Bacillariophyta which forms the basis of the species diversity of phytoperiphyton in the Daghestan coastal waters during all the seasons of the study. The rest zones are represented by a small number of species in the samples. A significant contribution of the Cyanophyta to the species composition is noted only in summer and autumn periods. The greatest species diversity of microalgae is observed from the end of August to October. The structure of the phytoperiphyton community varies in different seasons. In spring, the mass development of small-cell forms of Bacillariophyta and partially filamentous forms of Cyanophyta is noted, and in summer and autumn large forms of the Bacillariophyta, as well as the Dinophyta, Cyanophyta and Chlorophyta prevail. This effects on the quantitative indicators - the largest number of the microalgae is observed in spring and the biomass in summer. In species composition of the phytoperiphyton community a seasonal change of the leading complex has taken place during the study period. The dominant psychrophilous algae complex in spring and autumn with an increase in seawater temperature in summer is replaced by the thermophilic Cyanophyta, Chlorophyta and Dinophyta complex. There has also been a seasonal change of the dominants among the Bacillariophyta. Phytoperiphyton is mainly formed by the marine and brackish-aquatic species. The freshwater green microalgae are only observed in summer.
Pages: 25 - 31
Date: 28.06.2024